Buffer systems present in blood in maintaining the neutral ph of blood. which is the most important buffer system present in blood?
a. carbon monoxide-hydrogen buffer
b. carbonic acid-bicarbonate buffer
c. carbon dioxide-bicarbonate buffer

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?